RT9945 datasheet(13/33 Pages) RICHTEK

Part #	RT9945

Description	Power Management ICs for Handheld Device

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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13 / 33 page

RT9945

DS9945-01 April 2011

www.richtek.com

Typical Operating Characteristics

Buck1 Efficiency vs. Output Current

100

0.001

0.01

0.1

Output Current (A)

VBATT = 3.3V

VBATT = 3.7V

VBATT = 4.2V

VBuck1 = 1.8V

Buck2 Output Voltage vs. Output Current

1.31

1.32

1.33

1.34

1.35

1.36

1.37

1.38

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Output Current (A)

VBATT = 3.6V

VBuck2 = 1.35V

VBATT = 4V

Buck2 Efficiency vs. Output Current

100

0.001

0.01

0.1

Output Current (A)

VBATT = 3.3V

VBATT = 3.7V

VBATT = 4.2V

VBuck2 = 1.35V

VBATT = 4V

VBuck2, VLDO2 Power On from PWR_EN

Time (50

μs/Div)

VLDO2

(1V/Div)

VBuck2

(1V/Div)

PWR_EN

(1V/Div)

Buck1 Output Voltage vs. Output Current

1.75

1.76

1.77

1.78

1.79

1.8

1.81

1.82

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Output Current (A)

VBATT = 3.6V

VBuck1 = 1.8V

VBATT = 4V

VBuck1, VLDO1, VLDO2 Power On

Time (50

μs/Div)

VLDO3

(2V/Div)

VLDO1

(2V/Div)

VBuck1

(2V/Div)

RT9945 Datasheet(PDF) 13 Page - Richtek Technology Corporation

RT9945 Datasheet(HTML) 13 Page - Richtek Technology Corporation

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